He was recalled by
John Fisher in 1519 to teach Greek at Cambridge. It had been in abeyance since Erasmus's time (1511–1513), and he was Cambridge's second lecturer in Greek. He became
Public Orator at Cambridge in 1522, Fellow of
St John's College, Cambridge in 1523, and
Doctor of Divinity in 1524. In 1529 and 1530, he acted for
Henry VIII in Italy in the matter of the king's intended divorce from
Catherine of Aragon; he had earlier tutored Henry in Greek. Croke later tutored the illegitimate
Duke of Richmond and Somerset, his son. While seeking
canon lawyers to support Henry's side of the argument, he also contacted humanists (such as
Girolamo Ghinucci) and sought manuscripts. On his return to England, he in 1531 became deputy vice-chancellor of Cambridge and vicar of
Long Buckby, Nottinghamshire. A year later he moved to the
University of Oxford. He was a witness at the 1555 trial of
Thomas Cranmer. ==Works==